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Grassland birds have shown steeper, more consistent and more geographically
widespread decline in population than any other guild of North American
species (USGS, 1999; Dale, 1998). Recently, breeding bird surveys
in the United States and Canada have shown alarming declines in
grassland birds (Jones et al., 1998; Dale, 1998). For example, in
the Northeastern United States Bobolinks have declined by 38 percent
and Grasshopper Sparrows by 69 percent in the past 25 years. Preliminary
results from breeding bird surveys in Canada have shown significant
declines of several species.
Estimates of the numbers of breeding pairs of grassland/shrubland
birds found within the Carden Plain IBA, summer 2000.